Hsiao Jia-Huei, Chen Shih-Wen, Hung Bing-Yi, Uma Kasimayan, Chen Wei-Cheng, Kuo Chi-Ching, Lin Ja-Hon
National Taipei University of Technology Taipei 106 Taiwan
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology Taipei 106 Taiwan.
RSC Adv. 2020 Feb 19;10(13):7551-7558. doi: 10.1039/c9ra10462c. eCollection 2020 Feb 18.
The resonant energy transfer enhancement from a plasmonic random laser (PRL) has been investigated by means of a dye-covered PVA film with embedded silver nanoplates (DC-PVA/AgNPs). Different sizes and morphologies of AgNPs were adopted to shift the localized surface plasmon resonance (LSPR) and intensify recurrent light scattering between the AgNPs. For better overlap between surface plasmon resonance and the photoluminescence of fluorescent molecules with appropriately-sized silver nanoprisms, the slope efficiency of the PRL was greatly enhanced and the lasing threshold was obviously reduced. In addition, the photon lifetime for the DC-PVA/AgNPs film reveals an apparent decline around 1.39 ns owing to better coupling with LSPR. The stronger light scattering of samples with bigger-sized silver nanoprisms has been demonstrated by coherent back scattering measurements, which reveals a smaller transport mean free path around 3.3 μm. With -stable analysis, it has been successfully demonstrated that the tail exponent can be regarded as an identifier of the threshold of random lasing.
通过覆盖有染料的嵌入银纳米板的聚乙烯醇薄膜（DC-PVA/AgNPs），研究了来自等离子体随机激光器（PRL）的共振能量转移增强。采用不同尺寸和形态的AgNPs来移动局域表面等离子体共振（LSPR）并增强AgNPs之间的反复光散射。为了使表面等离子体共振与具有适当尺寸的银纳米棱镜的荧光分子的光致发光更好地重叠，PRL的斜率效率大大提高，激光阈值明显降低。此外，由于与LSPR更好地耦合，DC-PVA/AgNPs薄膜的光子寿命在1.39 ns左右明显下降。通过相干背散射测量证明了具有较大尺寸银纳米棱镜的样品具有更强的光散射，这表明其输运平均自由程较小，约为3.3μm。通过稳定性分析，已成功证明尾指数可被视为随机激光阈值的一个标识符。
